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95 Cards in this Set
- Front
- Back
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What terms are used to describe the physical qualities of fluids?
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Pressure transmission, incompressibility, expansion, and contraction
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What is the most commonly used gas in an aircraft hydraulic system?
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Nitrogen
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Who said “All gases expand and contract in direct proportion to the change in temperature, provided the pressure is constant”?
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Charles
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To obtain mechanical advantage use the formula, mechanical advantage equals
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resistance divided by effort.
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In the Metric system all basic units are divisible by
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10
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To convert centigrade to Fahrenheit you would
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multiply the centigrade temperature by 1.8 and add 32.
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If the lift of an aircraft is equivalent to its weight, theoretically, the aircraft should
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maintain a constant altitude.
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If an aircraft’s thrust is as great as its drag the aircraft should
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maintain a constant speed
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What flight control surface provides directional control about the vertical axis?
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Rudder.
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What are aerodynamic braking devices, known as speed brakes, used for?
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To decrease landing distances.
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What are aircraft trim systems used for?
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To correct minor deviations in flight attitude.
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Generally, trim systems are operated hydraulically,
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electrically, or electro-hydraulically.
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Corrosion is defined as the
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deterioration of a metal by reaction to its environment.
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What are the two types of penetrant inspections?
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Fluorescent and dye
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When you are inspecting an aircraft hydraulic system, what is the first component you should look at?
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The reservoir for proper servicing
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Where is the best place to start inspecting an aircraft rudder control system?
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In the flight deck
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How much pressure should be in the hydraulic system when the accumulator is initially air charged?
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Zero
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Shock struts should be serviced with what?
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Nitrogen
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If there is an improper oil level in the shock strut chamber, the
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strut could bottom out on landing
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During what troubleshooting step should you take care to notice all the symptoms of unsatisfactory system operation?
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Observe the problem.
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In what troubleshooting step do you examine probable causes that can be checked easily before trying those that require involved procedures?
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Isolate through elimination
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What is the maximum number of flats an MS B-nut can be tightened?
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2
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Why would you use a heavy plastic cover when proof testing a hose assembly?
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Provide protection for the person testing the hose in case of rupture.
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What is the length of a medium pressure hose assembly having the number MS28741–4–0124?
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12 and ½ inches.
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What is the first step in fabricating a medium pressure hose made of a Teflon® resin?
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Select the proper size bulk hose.
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An installed rubber hose’s identification markings spiral around the hose. This indicates the
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hose is twisted.
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What AFI covers the Composite Tool Kit (CTK) program?
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AFI 21–101, Aircraft and Equipment Maintenance Management.
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How are ball peen hammers classified?
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According to the weight of the head.
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What kind of pliers are mainly used for holding or bending flat or round stock?
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Slip-joint.
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If you use the point of diagonal pliers to cut material,
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the jaws will spring.
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To hold objects in tight places or make delicate adjustments, you would use
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needle-nose pliers.
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A disadvantage of the box-end wrench is that
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it must be lifted from the nut and repositioned for another turn.
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What wrench would be best used where an obstruction would prevent the use of a regular socket?
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Crowfoot
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What type of wrench is designed to fit into the recessed head of a setscrew or capscrew?
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Hex-head.
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Which punch would you use to break loose a tapered pin?
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Starting
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The total movement of a dial indicator is read by
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adding the minus reading with the plus reading.
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A tensiometer is used to measure the
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amount of tension applied to a cable.
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What is your first step when checking cable tension?
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Determine the cable size.
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A micrometer reading of 1.68 is equal to one and sixty-eight
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hundredths
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How far does a micrometer move for each complete revolution of the thimble?
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0.025 inch.
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One of the greatest abuses when using a micrometer is
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over tightening the thimble
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Torque wrenches should not be used in their lower
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20 percent range.
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When considering where to safety wire an electrical cannon plug, what should you not do?
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Safety wire it to a fuel, oil, or oxygen line.
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What minimum clearance should be maintained when clamping tubing to a rigid structure?
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1/16 inch
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MS flareless fittings are designed primarily for use
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in high-pressure systems that are subjected to severe vibrations.
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Why should you take care to not get any anti-seize material on the end of a pipe fitting during installation?
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May contaminate the hydraulic system
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The grip length of a bolt is the
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unthreaded area.
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What are the two general groups of aircraft nuts?
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Nonself-locking and self-locking
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The best way to determine if a cable has broken wires is to
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run a cloth along the length of the cable.
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When installing a hydraulic seal, what is the first step you should take?
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Check to see if the seal is the right size.
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Backup rings are not necessary in a hydraulic system when the operating pressure is less than
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1,500 psi.
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Most USAF aircraft designed to use MIL-H–5606 have been converted to use what hydraulic fluid?
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MIL-H–83282
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When is it permissible to heat a lubricant?
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Never
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In addition to a light film of hydraulic fluid, what can be used to lubricate a hydraulic seal?
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VV-P–236
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What type of cleaning solvent should be used on common parts removed from the nosewheel steering system?
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Technical order prescribed solvent
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What abrasive paper can be used to clean most surfaces?
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Aluminum oxide paper.
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To inhibit corrosion, MIL-S–81733 sealant has
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chromates
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Room temperature vulcanized sealants are
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silicone-based.
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The opposition to current flow is called what?
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Resistance
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What electrical circuit has only one path for current to flow?
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Series
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What is an open circuit?
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A circuit that is incomplete
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What is considered a shorted circuit?
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A circuit that produces larger than normal current flow.
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To check resistance, you should place the digital multimeter function selector rotary switch to what position?
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Ohms
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An ohmmeter indicates an open circuit when it reads what?
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Infinity.
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What type of electrical schematic leaves out the portions that are irrelevant?
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Specific-condition schematic
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What type of schematic should be used when trying to find wire numbers or splice points?
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Wiring diagram.
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What is a disadvantage of the wiring diagram?
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It’s so detailed as to be crowded.
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What TO will tell you the function of the components as well as how they’re supposed to work in the system?
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General system TO.
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How does a schematic show that the poles of a multiple-pole switch move together?
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The poles are connected by a dotted line.
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How, if at all, does a schematic show the various positions a switch can be in?
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The switch is labeled with text to indicate the switch positions
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When a schematic shows a switch, what does a triangle-shaped contact indicate?
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The switch is spring-loaded away from the triangle
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How are position switches positioned?
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By a moving surface
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In what position, if any, are relays generally drawn in schematics?
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In their de-energized positions.
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What is the function (purpose) of a diode?
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It allows current to flow in one direction only.
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How do electrical schematics indicate connected wires that cross each other?
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With a junction dot.
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What is a terminal board?
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A junction where various wires come together.
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Where should you start on an electrical schematic if you want to identify applied voltage?
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At the circuit breaker
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When following a schematic, where should you start if you’re trying to learn more about how a system works?
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At the control switches.
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The oil-fog lubricator on the hose cutting machine is serviced with
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SAE 10 weight motor oil.
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When using the skiving section of the hose cutting and skiving machine, how can you tell that the hose has been skived properly?
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The wire braid appears bright, but the wires are not disturbed.
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The three positions of the control switch on the clutch control box of the hose assembly machine are
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RUN, OFF, and JOG.
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On the Avitech® AV843 test stand, the hydraulic fluid heater automatically shuts off when the fluid reaches
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180 °F.
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The Avitech® AV843 test stand two-stage flowmeter is calibrated for use with
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MIL-H–5606, MIL-H–83282, and MIL-H–6083.
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At what pressure will the pressure system boost switch shut down the Avitech® AV843 test stand high-pressure pump motor?
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70 +or-10 psig.
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When performing a “before each use” inspection on the Avitech® AV843 test stand, what quantity level should the reservoir be at?
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¾.
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The Avitech® AV843 test stand’s air pump lubricator is serviced with
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SAE 10 oil.
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One hazard associated with the MJ–2A hydraulic test stand that is not prevalent in other pieces of AGE?
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possibility of a high-pressure line rupturing.
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During operation of the MJ–2A hydraulic test stand, the condition of the low-pressure filters can be determined by checking the
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filter inlet and outlet pressure
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The SGNSC’s 95.5% purity circuit ensures that the high pressure nitrogen is
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clean and dry.
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After the A/M32A–60 generator set has reached 95 percent of governed speed, you should
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reset the AC system.
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On the B–1 stand, the lock assembly rotates around the
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cylinder piston rod sleeve.
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Which maintenance stand uses four adjustable screw-type pads for leveling?
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B–2.
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You have pumped a B–5 stand up to the desired height, what should you do next?
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Close the vent plug
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Who may perform jacking operations?
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Qualified personnel
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The air vent on the jack’s reservoir is used to
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prevent a vacuum from being created
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